Panasonic SQ4-A21-N Liquid Leak Sensor

USD 154.80

NPN output liquid leak sensor with two-stage detection for incipient and abnormal leaks, IP67/IP65 rated polypropylene enclosure, 12-24VDC, SIL1/SIL3 safety.

SKU Pananonic-SQ4-A21-N Category
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Panasonic SQ4-A21-N Liquid Leak Sensor

Model Identifier SQ4-A21-N
Official Part Number SQ4-A21-N
GTIN Standard NA

Technical Overview

NPN output liquid leak sensor with two-stage detection for incipient and abnormal leaks, IP67/IP65 rated polypropylene enclosure, 12-24VDC, SIL1/SIL3 safety.

Key Features

  • Sensing type: Liquid leak detection using Infrared LED.
  • Dual channel NPN output for two-stage detection.
  • Output 1: ON when no liquid present, OFF when leakage detected or wrong installation.
  • Output 2: ON when normal condition, OFF when initial detection or accidental leakage.
  • Detects standard liquids (water) and various chemical liquids (sulfuric acid, hydrochloric acid, phosphoric acid, ammonia, Fluorinert™, Galden®, hydrofluoric acid etc.).
  • High ingress protection: IP67, IP65 (IEC).
  • Wide operating temperature range: -10 to +55°C.
  • Polypropylene enclosure for chemical resistance.
  • Meets Category 1, PLc, SIL1 safety standards as a standalone unit.
  • Achieves Category 4, PLe, SIL3 safety standards when used with the SQ4-C11 controller.
  • Pre-wired with 2m, 4-core, 0.18mm² PVC cabtyre cable.
  • Supply voltage: 12 to 24 VDC ±10%.
  • Current consumption: 30 mA or less.
  • Response time: Output 1: 10ms, Output 2: 50ms.

Features advanced two-stage detection to differentiate between incipient and abnormal liquid leaks, providing both warning and emergency stop signals, and incorporates self-detection for human error and sensor malfunctions to enhance overall safety.

Technical Specification Matrix

ParameterValue
SeriesSQ4
Sensing TypeLiquid leak detection sensors
Sensing SourceInfrared LED
Supply Voltage12 to 24 VDC ±10%
Current Consumption30 mA or less
Control OutputNPN x 2
Control Output Mode 1On when no liquid present, OFF when leakage detected or wrong installation
Control Output Mode 2ON when normal condition, OFF when initial detection or accidental leakage
Response Time Output 110ms
Response Time Output 250ms
Operating Temperature-10 to +55°C
Storage Temperature-10 to +55°C
Ambient Humidity35 to 85 % RH (No dew condensation or icing allowed)
IP RatingIP67, IP65 (IEC)
Enclosure MaterialPolypropylene
Cable0.18 mm² 4-core PVC cabtyre cable, 2 m long
Safety Performance (Standalone)Category 1, PLc, SIL1
Safety Performance (with SQ4-C11 controller)Category 4, PLe, SIL3
Sensing ObjectsWater (Standard liquid), Sulfuric acid, Hydrochloric acid, Phosphoric acid, Ammonia, Fluorinert™, Galden®, Hydrofluoric acid etc.
Physical Weight (kg)0.05
Dimensions L x W x H (cm)0 x 0 x 0

Industrial Applications

1. Semiconductor Manufacturing Facility Leak Monitoring

The Panasonic SQ4-A21-N is ideally suited for monitoring leakages in semiconductor manufacturing facilities where hazardous chemicals are processed. Its ability to detect various acids and chemicals, combined with its high IP rating, ensures robust operation in sensitive and potentially corrosive environments. The two-stage detection provides critical early warnings, preventing costly contamination and ensuring worker safety.

Problem Solved

Prevents catastrophic equipment damage, environmental contamination, and worker safety hazards from chemical spills. Ensures operational uptime by providing early detection for preventative maintenance in critical cleanroom environments.

Chemical leak detectionSemiconductor processingCleanroom safetyHazardous materialsNPN outputIP67Two-stage detectionPreventative maintenance

2. Industrial Refrigeration System Coolant Leak Detection

This sensor can be deployed to detect leaks of water or other coolants in industrial refrigeration systems. Its operating temperature range of -10 to +55°C and IP67/IP65 rating make it suitable for challenging cold and damp industrial settings. Early detection of coolant leaks prevents energy loss, equipment malfunction, and potential structural damage due to prolonged moisture exposure.

Problem Solved

Minimizes water damage, prevents slippery floor hazards, reduces energy waste from coolant loss, and protects expensive refrigeration equipment from premature failure by detecting leaks promptly.

Industrial refrigerationCoolant leak detectionWater detectionIP65NPN controlTemperature rangeFacility maintenanceEnergy efficiency

3. Pharmaceutical Production Line Spill Prevention

In pharmaceutical manufacturing, maintaining cleanliness and preventing cross-contamination are crucial. The SQ4-A21-N's polypropylene enclosure and ability to detect standard liquids make it perfect for monitoring process lines, mixing tanks, or filling stations for accidental spills. The two-stage detection capability allows for immediate intervention, mitigating the risk of major contamination events and ensuring compliance with stringent hygiene regulations.

Problem Solved

Prevents product contamination, ensures compliance with strict hygiene and safety regulations, and significantly reduces costly clean-up operations and batch losses due to spills, enhancing overall production integrity.

Pharmaceutical manufacturingSpill detectionProcess monitoringContamination controlNPN outputPolypropyleneHygiene regulationsSCADA integration
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